Abstract: The invention relates to a material for electric contacts taking silver tin-oxide as basis, consisting of silver or mainly silver-containing alloy, tin oxide and other oxides or carbides of tungsten, molybdenum, vanadium, bismuth, titanium, and/or copper.

Abstract: A method and an apparatus reduces particles in exhaust gases of an internal combustion engine by passing the exhaust gases through a microwave energy field in a resonator for applying energy and burning the particles. In order to improve the application of energy, the particles are agglomerated beforehand in a high-voltage field of an electrostatic filter.

Abstract: A solid electrolyte with a multi-layer electrode applied to it. This multi-layer construction prevents electrochemical decomposition reactions which limit the durability and length of service life of conventional electrodes.

Abstract: A compound or composite powder which includes metallic or ceramic whiskers embedded in a metallic or ceramic matrix as host material, the whiskers have a length between 5.times.10.sup.-6 m and 2.times.10.sup.-4 m and diameters between 2.times.10.sup.-7 m and 1.times.10.sup.-5 m, and are embedded in the matrix with a volume proportion of whisker content between 1 to 50% (by volume), the reference being to a pore-free compacted compound/composite material; the whiskers being made of SiC, Si.sub.-3 N.sub.-4, Al.sub.-2 O.sub.-3 or ZrO.sub.-2 and are embedded in a ceramic matrix being Al.sub.-2 O.sub.-3, Al.sub.-2 O.sub.-3 +from 5 to 40% ZrO.sub.-2 +from 0 to 5% Y.sub.-2 O.sub.-3 or ZrO.sub.-2 with 3 to 15% Y.sub.-2 O.sub.-3 or Si-nitride or Si-carbide. Alternatively the whiskers are made of Si.sub.-3 N.sub.-4, Al.sub.-2 O.sub.-3, ZrO.sub.-2 or W and the matrix is made of W, Mo, Fe, Ni, Co, Cu or an alloy thereof.

Abstract: The electrode is made by depositing a slurry as a first layer onto a solid electrolyte ceramic of stabilized ZrO.sub.2. The slurry is a blend of a powder of a ceramic electronic conductor such as La.sub.1-x Ca.sub.x Mn.sub.1+y 03 or La.sub.1-x SR.sub.x Sr.sub.x Mn.sub.1+y 03 and a powder of a ceramic ionic conductor being of the same kind as the electrolyte. Onto the first layer a slurry of powder of the same ceramic electronic conductor used in the first slurry is deposited as a second layer. The layers are deposited by spray coating or dipping and are fired simultaneously thereafter or sequentially following respective application.

Abstract: This invention relates to a sintering process. More particularly, this invention relates to a process for preparing a sintered form having a tungsten content which comprises the steps of:(a) sintering a porous form of pressed tungsten alloy powders having a high tungsten content in solid phase, and(b) heat treating the sintered part from step (a) in a liquid phase.

Abstract: A heterogenous powder comprising particles of tungsten grains with a diameter of less than 1 .mu.m with a binder sponge-like coating of at least one metal selected from the group consisting of nickel, copper, silver, iron, cobalt, molybdenum and rhenium with a particle diameter of 10 to 50 .mu.m, a process for the preparation thereof, method of forming sintered elements therefrom and the elements produced thereby being useful as penetrating projectiles.

Abstract: This invention relates to a silver powder of Ag/CdO composition for use in electrical contacts comprising particles in the size range of about 1 to 10 microns and containing cadmium oxide in the form of a precipitate with a grain size less than about 0.5 micron.

Abstract: A sensor measuring the partial oxygen pressure in furnace exhaust gas has an active layer of palladium. When the sensor is maintained at a particular temperature, for example about 700.degree. C., the palladium changes to palladium oxide at a specific air number, namely 1.2. The change from palladium to palladium oxide and vice versa causes a change in conductivity by a factor of approximately 20. This change in conductivity is a clearly defined output signal which can be adjusted to occur at any desired air number in the region from 1.05-1.4, depending upon the temperature at which the sensor is maintained. Two sensors may be used, each maintained at a different temperature so that a control region is defined as the air number region wherein the sensor maintained at the lower temperature is oxidized while the second sensor is reduced. Preferably, the active layer consists not only of the metal oxide but also of a ceramic component such as cerium oxide which is doped with 0.5-10% by volume of Nb.sub.2 O.sub.

Abstract: A hard ferrite powder with the composition BaO.6Fe.sub.2 O.sub.3 composed of particles in the size range from about 1 to 10 microns and being easily separated into primary grains (monocrystal domains) which contain at least about 85% of primary grains with hexagonal lattice structures and sizes equal to or less than 0.5 micron.

Abstract: This invention relates to a material for the manufacture of porous electrodes for electrochemical high temperature cells and measuring sondes having oxygen ion-conducting solid electrolytes based on zirconium dioxide or cerium dioxide, comprising an admixture of mixed oxides having a perovskite structure based on LaMnO.sub.3 or LaNiO.sub.3 or LaCoO.sub.3, and small amounts of chromium and monovalent or bivalent cations selected from the group of the alkali elements or the alkaline earth elements or of Zn, Cd, Mg, Sn, or Pb. The invention also relates to a process for the manufacture of electrode material.

Abstract: A body suitable for conductively connecting respective electrodes of closely coupled fuel cells arranged in series circuit and operating at temperatures of at least 600.degree. C. consists of two conductively bonded ceramic materials having electronic conductivities of at least one mho/cm at 1000.degree. C. at respective ambient partial oxygen pressures between 10.sup.-5 bar and one bar, and below 10.sup.-5 bar.

Abstract: A compound cell for performing an electrochemical reaction at high temperature consists essentially of hollow, cylindrical bodies of a ceramic electrolyte, rings of an electronically conductive material coaxially interposed between each pair of electrolyte bodies, annular layers of ceramic insulating material bonding each ring to at least one of the two adjacent electrolyte bodies, the bodies, rings, and annular layers being diffusion welded to each other to form a cylindrical, gas-tight tube. A pair of electrode layers is associated with each electrolyte body, one layer of the pair covering the associated body inside the tube and conductively engaging one of the two adjacent rings, the other electrode layer of the pair covering the associated body outside the tube and conductively engaging the other adjacent ring.